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Counterparty Risk

Counterparty credit risk (CCR) is the risk that the other party to a derivative contract defaults before the final settlement of cash flows. Unlike straight loan credit risk, CCR is bilateral and stochastic because the mark-to-market value, and therefore the exposure, fluctuates with market prices. The risk is most severe in OTC markets and is mitigated through central clearing, initial and variation margin, netting agreements under an ISDA Master, and post-GFC regulatory reforms.

Why it matters

Think of a 12-month forward contract on AUD/USD. The contract itself has no money changing hands at inception, but six months in, if the AUD has moved against your counterparty, they owe you a large mark-to-market amount. If they file for bankruptcy that day, you join the queue of unsecured creditors. The exposure is the positive replacement cost of the contract at default, not the notional amount. That is why a USD 100 million notional swap can produce a USD 5 million loss rather than a USD 100 million loss.

Formulas

Exposure at default
EADt=max⁡(Vt,0)EAD_t = \max(V_t, 0)
Loss occurs only when the contract has positive value to the surviving party. If Vt<0V_t < 0, the surviving party owes the defaulter and has no credit loss.
Expected loss on a derivative
EL=PD×LGD×EEEL = PD \times LGD \times EE
PDPD is probability of default, LGDLGD is loss given default, and EEEE is expected exposure over the life of the contract.

Worked examples

Scenario

Bank A enters a 5-year interest rate swap with Bank B on a notional of A$200 million. Bank A pays fixed at $4\%$ and receives BBSW. After two years, rates have fallen and the swap has a positive mark-to-market value of A$8 million to Bank A. Bank B then defaults.

Solution

Bank A's exposure is the A$8 million replacement cost, not the A$200 million notional. To restore its hedge, Bank A must enter a new swap with another dealer at current market rates, and the A$8 million represents the present value of the cash flows lost. If a Credit Support Annex (CSA) required Bank B to post collateral equal to the mark-to-market, the loss would be close to zero. Without collateral, Bank A becomes an unsecured creditor in the bankruptcy estate.

Scenario

Lehman Brothers, September 2008. Lehman had roughly USD 35 trillion in OTC derivatives notional outstanding across 1.5 million contracts. Counterparties faced the question of which trades had positive value to them and how to close out at fair prices in a stressed market.

Solution

The Lehman failure exposed weaknesses in bilateral OTC markets: opaque exposures, slow close-out, valuation disputes, and limited collateral. The G20 response at the Pittsburgh Summit in 2009 required standardised OTC derivatives to be centrally cleared through CCPs and reported to trade repositories, transferring much CCR from bilateral counterparties to clearing houses.

Common mistakes

  • ✗Counterparty risk only matters at maturity. It can crystallise any time the contract has positive value to the surviving party and the other side defaults. A 10-year swap exposes both parties for the full 10 years.
  • ✗Counterparty exposure equals the notional amount. The loss equals the positive replacement cost max⁡(Vt,0)\max(V_t, 0), which is usually a small fraction of notional. A US$100 million swap may give rise to a US$2 to US$5 million loss.
  • ✗Central clearing eliminates counterparty risk. It concentrates it at the CCP, which then manages it through margin, default funds, and waterfall procedures. A CCP failure would be systemic, which is why CCPs are now treated as critical financial market infrastructure.

Revision bullets

  • •Risk the other side defaults before final settlement
  • •Exposure =max⁡(Vt,0)= \max(V_t, 0), the positive mark-to-market
  • •Highest in uncollateralised OTC derivatives
  • •Mitigated by clearing, margin, netting, ISDA CSAs
  • •G20 Pittsburgh 2009 mandated central clearing of standardised OTC
  • •Lehman 2008 crystallised the need for reform

Quick check

Counterparty credit risk on a derivative is highest in which setting?

A bank holds an OTC swap with a notional of A$100 million and a current mark-to-market value of A$3 million in its favour. The counterparty defaults today. The bank's loss is closest to:

Connected topics

Exchange/OTCClearingNovation

In learning paths

Foundations Path

Sources

  1. Hull (2022), Ch. 24
    Hull, John C. Options, Futures, and Other Derivatives. 11th ed. Pearson, 2022. ISBN 978-0-13-693997-9.
    Chapter 24 covers credit risk, default probabilities, recovery rates, and credit value adjustment (CVA) for derivative portfolios.
  2. BIS (2018), Incentives to centrally clear OTC derivatives
    Bank for International Settlements, Financial Stability Board, IOSCO and Basel Committee. Incentives to centrally clear over-the-counter (OTC) derivatives. BIS, November 2018.
    Authoritative post-GFC review of how regulatory reforms shifted counterparty risk from bilateral OTC contracts to CCPs.
  3. FSB (2024), 15 Years after Pittsburgh
    World Federation of Exchanges. Reflections on Central Clearing: 15 Years after the Pittsburgh Summit. Focus, 2024.
    Retrospective on the G20 Pittsburgh commitments to clear standardised OTC derivatives and report trades to repositories.
  4. ISDA Master Agreement (2002)
    International Swaps and Derivatives Association. 2002 ISDA Master Agreement and Credit Support Annex documentation. ISDA.
    Industry-standard contract that governs OTC derivative trading, including close-out netting and collateral provisions that mitigate CCR.
How to cite this page
Dr. Phil's Quant Lab. (2026). Counterparty Risk. Derivatives Atlas. https://phucnguyenvan.com/concept/counterparty-risk
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